I think the main reason is because sometimes,

the entires of our program is not a python file, it might be launch of a docker image, a gunicorn application, even a background task etc. or it might be wrapped by some 3rd launcher.  

And sometimes it will coming through many steps before hit the break point. 


Eli Zaretskii <eliz@gnu.org>于2019年10月8日 周二00:19写道：
> From: Lawrence Liu <smartlitchi@gmail.com>
> Date: Mon, 7 Oct 2019 12:33:17 +0800
> Cc: Andrii Kolomoiets <andreyk.mad@gmail.com>, emacs-devel@gnu.org
>
> I am a full time python developer and seems in my case mostly I am using the way as below:
>
> insert a
>
> import pdb; pdb.set_trace();
>
> in my code bass and trigger the break point from other place (mostly browser) and wait for the break point
> been hit.

Any reason you don't use "M-x pdb" instead?
--
Best Regards
Lawrence